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pedra angularThe keystone is crucial for the arch's stability.
A pedra angular é crucial para a estabilidade do arco.The central stone at the top of an arch that holds the other stones in place.
The architect pointed out the keystone in the design.
O arquiteto apontou a pedra angular no design.Without the keystone, the arch would collapse.
Sem a pedra angular, o arco colapsaria.They carefully placed the keystone to complete the structure.
Eles colocaram cuidadosamente a pedra angular para completar a estrutura.arch keystone
pedra angular centralcentral keystone
pedra angular centralkeystone species
espécies-chavecapstone
summit
climax
